Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
  • C09J133/04—Homopolymers or copolymers of esters
  • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
  • C09J133/08—Homopolymers or copolymers of acrylic acid esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2/00—Processes of polymerisation
  • C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
  • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
  • C08F20/10—Esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/04—Acids; Metal salts or ammonium salts thereof
  • C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/12—Esters of monohydric alcohols or phenols
  • C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
  • C08F220/30—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F287/00—Macromolecular compounds obtained by polymerising monomers on to block polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
  • C09J133/04—Homopolymers or copolymers of esters
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
  • C09J133/04—Homopolymers or copolymers of esters
  • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
  • C09J133/10—Homopolymers or copolymers of methacrylic acid esters
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
  • C08G2261/10—Definition of the polymer structure
  • C08G2261/12—Copolymers
  • C08G2261/126—Copolymers block
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
  • Y10T428/2852—Adhesive compositions
  • Y10T428/2878—Adhesive compositions including addition polymer from unsaturated monomer
  • Y10T428/2891—Adhesive compositions including addition polymer from unsaturated monomer including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

Definitions

• the present invention relates to a curable resin composition, an adhesive composition using the curable resin composition, a cured object formed from the adhesive composition, or a composite comprising bonded objects coated or bonded by the cured object.
• SGA second-generation acrylic
• SGA's are of two-component type, they do not require the two components to be precisely weighed, and they can be set in a few minutes or a few tens of minutes at room temperature, even when incompletely weighed or mixed, and sometimes simply on contact of the two components, so they excel in their usability. Furthermore, SGA's have high peel adhesion strength and impact adhesion strength, and have good curing of exposed portions, and are therefore widely used.
• Patent Document 1 discloses an adhesive that adheres to transparent resins without loss of transparency.
• Patent Document 1 Since the adhesive disclosed in Patent Document 1 is of wet-set type, it has room for improvement in that the adhesive will not set or will take an extremely long time to set when attempting to bond objects into which moisture does not penetrate. For this reason, there has been a strong demand for SGA's capable of being cured in a short time at room temperature while providing high adhesive strength. However, the acrylic rubber and curing agents used in conventional SGA's are colored, making it difficult to prepare transparent cured objects.
• the present invention was developed to satisfy these market demands.
• the present inventors discovered that the above-mentioned problems can be solved by blending certain ingredients (acrylic block copolymers) into the composition of a two-component type acrylic adhesive, thereby resulting in the present invention.
• the present invention offers a curable resin composition
• a curable resin composition comprising (1) a polymerizable vinyl monomer, (2) a curing agent, (3) a reducing agent and (4) an acrylic block copolymer.
• the acrylic block copolymer preferably has the structure represented by the following formula (1): [a 1 ]-[b]-[a 2 ] (1) wherein
• [a 1 ] and [a 2 ] respectively represent, independent of each other, a polymer block consisting mainly of structural units derived from alkyl acrylate esters and/or alkyl methacrylate esters;
• [b] represents a polymer block consisting mainly of structural units derived from alkyl acrylate esters and/or alkyl methacrylate esters.
• the curable resin described above has high strength and/or adhesion after curing, as well as high transparency.
• the present invention offers the above-described curable resin composition wherein the weight-average molecular weight of the (4) acrylic block copolymer is 5,000 to 4,000,000. This curable resin composition is even more effective.
• the present invention offers the above-described curable resin composition wherein the molecular weight distribution of the (4) acrylic block copolymer is 0.5 to 1.5. This curable resin composition is even more effective.
• the present invention offers the above-described curable resin composition wherein the (3) reducing agent is at least one thiourea derivative chosen from the group consisting of acetyl-2-thiourea, benzoylthiourea, N,N-diphenylthiourea, N,N-diethylthiourea, N,N-dibutylthiourea and tetramethylthiourea.
• the (3) reducing agent is at least one thiourea derivative chosen from the group consisting of acetyl-2-thiourea, benzoylthiourea, N,N-diphenylthiourea, N,N-diethylthiourea, N,N-dibutylthiourea and tetramethylthiourea.
• This curable resin composition is even more effective.
• the present invention offers the above-described curable resin composition wherein the (1) polymerizable vinyl monomer is a polymerizable (meth)acrylic acid derivative.
• This curable resin composition is even more effective.
• the present invention offers the above-described curable resin composition wherein the (1) polymerizable vinyl monomer comprises the polymerizable (meth)acrylic acid derivatives (i), (ii) and (iii):
• Z 3 and Z 4 represent CH 2 ⁇ CHCO— or CH 2 ⁇ C(CH 3 )CO—
• R 4 and R 5 represent —C 2 H 4 —, —C 3 H 6 —, —CH 2 CH(CH 3 )—, —C 4 H 8 — or —C 6 H 12 —
• R 6 and R 7 represent hydrogen or an alkyl group having 1 to 4 carbon atoms
• q and r represent an integer from 0 to 8.
• the present invention offers the above-described curable resin composition, further comprising a paraffin.
• this curable resin composition the portion in contact with air sets quickly, enabling the adhesion to be improved.
• the present invention offers the above-described curable resin composition, further comprising a (meth)acrylic acid.
• This curable resin composition enables the adhesion to be improved.
• the present invention offers the above-described curable resin composition, which is a two-component type curable resin composition, the first component comprising at least the (2) curing agent and the second component comprising at least the (3) reducing agent. Since this curable resin composition enables a curing reaction to be induced at the time of use, it is highly applicable to various applications.
• the present invention offers an adhesive composition comprising the above-described curable resin composition.
• This adhesive composition provides excellent adhesion.
• the present invention offers an adhesive composition for use with a transparent resin comprising the above-described curable resin composition.
• This adhesive composition for use with a transparent resin exhibits excellent adhesion to transparent resins, and/or has high transparency, and is therefore suitable for use with transparent resins.
• the present invention offers a cured object comprising the above-described curable resin composition.
• This curable resin composition has high strength, and is therefore suitable for use in bonding, coating and the like.
• the present invention offers a composite having an adhered object coated or bonded by the above-described cured object. Due to the high strength of the above-described cured object, this composite can exist in a state wherein the adhered object is strongly adhered.
• the present invention offers a composite wherein the adhered object of the above-described composite is a transparent resin. Due to the high transparency of the above-described cured object, this composite is able to have a high transparency overall.
• glass transition temperature shall refer to the temperature at which the glass transition occurs in amorphous solid materials generally used in the present technical field.
• the amorphous state at a lower temperature than this glass transition point is known as the glass state, while the substance is held to be in a liquid or rubber state at temperatures higher than the glass transition point.
• the glass transition point can be determined by measuring one of the properties that suddenly change at the glass transition point, such as rigidity and viscosity, and monitoring the change depending on temperature. Specific examples of methods for measuring the glass transition temperature include, but are not limited to, the methods described below.
• (meth)acrylic refers to “acrylic” and “methacrylic”. Additionally, “structure derived from” and “derivative” refer to arbitrary derivatives (like those having substituents such as alkyls) that do not result in loss of the effects of the present invention, and include various derivatives used in the present technical field.
• weight-average molecular weight may be measured by normal methods used in the present technical field such as various types of size exclusion chromatography.
• An example of size exclusion chromatography is a method performed, for example, using the below-identified device and conditions, although the invention is not limited thereto.
• molecular weight distribution shall refer to the value of (weight-average molecular weight/number-average molecular weight). Specifically, taking the chain length distribution obtained by the above-mentioned size exclusion chromatography as an example, the value can be calculated by computing the polystyrene-converted weight-average molecular weight (Mw) and number-average molecular weight (Mn), then determining the value of Mw divided by Mn (Mw/Mn).
• two-component type curable resin composition and “two-component type adhesive composition” refer to curable resin compositions or adhesive compositions having, as substantial curable resin components or adhesive components, two components that are combined to obtain a composition suitable for the present invention. Curable resin compositions or adhesive compositions further comprising a third component within such a range as not to detract from the purpose of the present invention, and embodiments wherein a first component and a second component are consecutively applied to an adhesion surface or coating surface so as to substantially constitute the first component and second component on the coating surface are also included among the “two-component type curable resin composition” and “two-component type adhesive composition” of the present specification.
• bonding refers to the fixation of a structure to another structure in a connected state.
• bonding refers to the case in which different parts of the same structure are connected.
• coating in the present specification refers to covering at least a portion of the surface of a structure by a certain substance (such as the cured object of the present invention).
• the structures which are being bonded or coated shall be referred to as “bonded object”, the structure after bonding or coating shall be referred to as “(bonded or coated) composite”, the surfaces of the composite that are connected together shall be referred to as “bonding surfaces”, the portions where the bonding surfaces or the composites are connected shall be referred to as “bonding portions” and the coated surfaces of the composite shall be referred to as “coating surfaces”.
• adheresive composition shall refer to compositions used for applications such as fixation of a structure to another structure in a connected state by means of the composition, in other words, the above “bonding”, and compositions used for applications such as covering at least a portion of the surface of a structure, in other words, the above “coating”. Additionally, an object obtained by curing an adhesive composition shall be referred to as a “cured object”.
• transparent resin shall refer to resins capable of transmitting a standard amount of visible light, especially resins used to take advantage of their transparency.
• transparent resins include, but are not limited to, resins having a transparency of at least 20% at one or more wavelengths in the visible range (380 to 750 nm), preferably resins having a transparency of at least 50%, more preferably resins having a transparency of at least 80%, even more preferably resins having a transparency of at least 90%, and most preferably resins having a transparency of at least 95%, at least 98%, at least 99% or 100%.
• the expression “consisting mainly of”, while not limited thereto, indicates that the component in question is present in an amount of at least 70 mass % with respect to the total mass, preferably at least 80 mass %, more preferably at least 90 mass %, even more preferably at least 95 mass %, and most preferably at least 98 mass %, at least 99 mass % or 100%.
• the present embodiment offers a curable resin composition
• a curable resin composition comprising (1) a polymerizable vinyl monomer, (2) a curing agent, (3) a reducing agent and (4) an acrylic block copolymer having a structure represented by the following formula (1): [a 1 ]-[b]-[a 2 ] (1) wherein
• [a 1 ] and [a 2 ] respectively represent, independent of each other, a polymer block consisting mainly of structural units derived from an alkyl acrylate ester and/or an alkyl methacrylate ester, and having a glass transition temperature of at least 90° C.;
• [b] represents a polymer block consisting mainly of structural units derived from an alkyl acrylate ester and/or an alkyl methacrylate ester, and having a glass transition temperature of no more than ⁇ 10° C.;
• This curable resin has high strength and/or adhesion after curing, and has high transparency.
• the (1) polymerizable vinyl monomer used in the present invention is not particularly limited, and various vinyl monomers having vinyl groups capable of undergoing radical polymerization may be used, within such a range as not to detract from the effects of the present invention.
• the polymerizable vinyl monomer is preferably a (meth)acrylic acid derivative.
• (meth)acrylic acid derivatives include, for example, the following monomers (i) to (vi), although the invention is not limited thereto.
• Examples of monomers according to the above (i) include, but are not limited to, methyl (meth)acrylate, cyclohexyl (meth)acrylate, benzyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, dicyclopentyl (meth)acrylate, dicyclopentenyl (meth)acrylate, glycerol (meth)acrylate, glycerol di(meth)acrylate, isobornyl (meth)acrylate and (meth)acrylic acid.
• Examples of monomers according to the above (ii) include, but are not limited to, ethoxyethyl (meth)acrylate, polyethylene glycol (meth)acrylate, phenoxyethyl (meth)acrylate, dicyclopentenyl oxyethyl (meth)acrylate, phenoxydiethylene glycol (meth)acrylate, tripropylene glycol di(meth)acrylate and 1,6-hexanediol di(meth)acrylate.
• Z 3 and Z 4 represent CH 2 ⁇ CHCO— or CH 2 ⁇ C(CH 3 )CO—
• R 4 and R 5 represent —C 2 H 4 —, —C 3 H 6 —, —CH 2 CH(CH 3 )—, —C 4 H 8 — or —C 6 H 12 —
• R 6 and R 7 represent hydrogen or an alkyl group having 1 to 4 carbon atoms
• q and r represent an integer from 0 to 8.
• Examples of monomers according to the above (iii) include, but are not limited to, 2,2-bis(4-(meth)acryloxyphenyl)propane, 2,2-bis(4-(meth)acryloxyethoxyphenyl)propane, 2,2-bis(4-meth)acryloxydiethoxyphenyl)propane, 2,2-bis(4-(meth)acryloxypropoxyphenyl)propane and 2,2-bis(4-(meth)acryloxytetraethoxyphenyl)propane.
• Examples of monomers according to the above (iv) include, but are not limited to, trimethylolpropane tri(meth)acrylate, neopentylglycol di(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate and tris(2-acryloyloxyethyl)isocyanate.
• Examples of monomers according to the above (v) include, but are not limited to, those capable of being obtained by reactions between (meth)acrylic acid esters having a hydroxyl group, organic polyisocyanates and polyhydric alcohols.
• examples of the (meth)acrylic acid esters having a hydroxyl group include, but are not limited to, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate and hydroxybutyl (meth)acrylate.
• organic polyisocyanates include, but are not limited to, toluene diisocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.
• polyhydric alcohols include, but are not limited to, polyethylene glycol, polypropylene glycol, polytetramethylene glycol and polyester polyol.
• R 8 represents a CH 2 ⁇ CR 9 CO(OR 10 ) u — group (with the proviso that R 9 represents a hydrogen or a methyl group and R 10 represents —C 2 H 4 —, C 2 H 6 —, —CH 2 CH(CH 3 )—, C 4 H 8 —, —C 6 H 12 — or
• u represents an integer from 1 to 10
• t represents an integer 1 or 2.
• acidic phosphoric acid compounds include, but are not limited to, acid phosphoxyethyl (meth)acrylate, acid phosphoxypropyl (meth)acrylate and bis(2-(meth)acryloyloxylethyl)phosphate.
• One or more of the monomers described in paragraphs (i)-(vi) above may be used.
• the use of one or more from the group consisting of (i), (ii) and (iii) is preferable, and the use of (i), (ii) and (iii) in combination is more preferable, due to their high adhesion and low adhesive strain in the bonded object after adhesion.
• the (2) curing agent used in the present embodiment is not particularly limited as long as it can be used to increase the hardness and promote or control the curing reaction, within such a range as not to detract from the effects of the present invention, and organic peroxides are preferred.
• organic peroxides include, but are not limited to, cumene hydroperoxide, paramenthane hydroperoxide, tertiary butyl hydroperoxide, diisopropylbenzene dihydroperoxide, methylethylketone peroxide, benzoyl peroxide and tertiary butyl peroxybenzoate. Of these, cumene hydroperoxide is preferred for its stability.
• the amount of curing agent used is preferably 0.1 to 20 parts by mass, more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the polymerizable vinyl monomer. At 0.1 parts by mass or more, a satisfactory curing rate is achieved, and at 20 parts by mass or less, a high storage stability is achieved.
• the (3) reducing agent used in the present embodiment is not particularly limited as long as it is a reducing agent that reacts with the polymerization initiator of the present invention to generate radicals, within such a range as not to detract from the effects of the present invention. While the reducing agent is not particularly limited, a thiourea derivative is preferred.
• thiourea derivatives include, but are not limited to, acetyl-2-thiourea, benzoylthiourea, N,N-diphenylthiourea, N,N-diethylthiourea, N,N-dibutylthiourea and tetramethylthiourea.
• one or more thiourea derivatives chosen from the group consisting of acetyl-2-thiourea, benzoylthiourea, N,N-diphenylthiourea, N,N-diethylthiourea, N,N-dibutylthiourea and tetramethylthiourea are preferred for greater effect, and acetyl-2-thiourea is more preferred.
• the amount of reducing agent such as a thiourea derivative used is preferably 0.05 to 15 parts by mass, and more preferably 0.5 to 5 parts by mass, with respect to 100 parts by mass of the polymerizable vinyl monomer.
• the curing rate can be favorably increased, while a high storage stability can be achieved at 15 parts by mass or less.
• the (4) acrylic block copolymer used in the present embodiment is preferably a block copolymer having the structure represented by the following formula (1): [ a 1 ]-[ b ]-[ a 2 ] (1)
• the types of structures derived from the alkyl acrylate ester and/or alkyl methacrylate esters [a 1 ] and [a 2 ] in Formula (1) are not particularly limited as long as they are within such a range as not to detract from the effects of the present invention, and may be of any type as long as they are (meth)acrylate esters constituted from acrylic acid components and alcohol components, but (meth)acrylate esters having an alcohol component with 1 to 15 carbon atoms are preferable.
• (meth)acrylate esters include, but are not limited to, primary alkyl (meth)acrylate esters such as methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, 2-ethylhexyl (meth)acrylate and lauryl (meth)acrylate, glydicyl (meth)acrylate, ally (meth)acrylate, 2-methoxyethyl (meth)acrylate, 3-methoxybutyl (meth)acrylate, trimethoxysilylpropyl (meth)acryalte, trifluoroethyl (meth)acrylate, isopropyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate, cyclohexyl (meth)acrylate
• the (meth)acrylate esters [a 1 ] and [a 2 ] may be of one or more types.
• the effects of blocking efficiency etc. are particularly pronounced in polymerization where the (meth)acrylate esters [a 1 ] and [a 2 ] are primary alkyl (meth)acrylate esters, so the (meth)acrylate esters [a 1 ] and [a 2 ] that are used should preferably be mainly primary alkyl (meth)acrylate esters.
• the polymer blocks should preferably have a glass transition temperature of at least 90° C.
• the polymer blocks should more preferably have a glass transition temperature of 90 to 150° C.
• the polymer blocks should most preferably have a glass transition temperature of 100to 120° C.
• the type of structure derived from the alkyl acrylate ester and/or alkyl methacrylate ester of [b] in Formula (1) is not particularly limited as long as it has a chemical structure differing from [a 1 ] and [a 2 ], within such a range as not to detract from the effects of the present invention.
• Typical examples include the (meth)acrylate esters mentioned above.
• the polymer blocks should preferably have a glass transition temperature of ⁇ 10° C. or less, the polymer blocks should more preferably have a glass transition temperature of ⁇ 30 to ⁇ 70° C., and the polymer blocks should most preferably have a glass transition temperature of ⁇ 45 to ⁇ 50° C.
• the ratio (total mass of [a′] and [a 2 ]/(mass of [b]) in the (4) acrylic block copolymer should be 5/95 to 80/20, preferably 5/95-70/30, more preferably 15/85 to 65/35, and most preferably 40/60 to 55/45, in order to achieve good solubility, adhesiveness and transparency.
• the (4) acrylic block copolymer should preferably be a triblock copolymer of polymethylmethacrylate/poly-n-butylacrylate/polymethylmethacrylate, in order to achieve good solubility, adhesiveness and transparency.
• the weight-average molecular weight of the (4) acrylic block copolymer should preferably be 5,000 to 4,000,000, preferably 10,000 to 100,000, more preferably 30,000 to 80,000 and most preferably 50,000 to 70,000 for greater effect.
• the molecular weight distribution (weight-average molecular weight/number-average molecular weight) of the acrylic block copolymer should preferably be 0.5 to 1.5, more preferably 0.7 to 1.3, and most preferably 1.0 to 1.2 in order to achieve better solubility, adhesiveness and transparency.
• the amount of the acrylic block copolymer used is preferably 2 to 80 parts by mass, more preferably 40 to 70 parts by mass with respect to 100 parts by mass of the polymerizable vinyl monomer. At 2 parts by mass or more, the adhesive force and transparency are high, and at 80 parts by mass or less, the viscosity is low so high usability can be maintained.
• the curable resin composition of the present embodiment may use various types of paraffins in order to quickly cure the portions coming into contact with air.
• paraffins include, but are not limited to, paraffin wax, microcrystalline wax, carnauba wax, beeswax, lanolin, spermaceti, ceresin and candelilla wax.
• the amount of paraffin used is preferably 0.01 to 2.5 parts by mass, more preferably 0.05 to 0.5 parts by mass with respect to 100 parts by mass of polymerizable vinyl monomer. At 0.01 parts by mass or more, the hardness of the portion coming into contact with air can be satisfactorily maintained, and at 2.5 parts by mass or less, a satisfactory adhesive strength can be achieved.
• the curable resin composition of the present embodiment may use (meth)acrylic acid in order to improve the adhesiveness.
• the amount of (meth)acrylic acid used is preferably 0.1 to 20 parts by mass, more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the polymerizable vinyl monomer.
• the curable resin composition of the present embodiment can be used as an adhesive composition as is, in a more preferable embodiment, it can be used as a two-component type adhesive composition.
• the two-component format may include the (2) curing agent in the first component and the (3) reducing agent in the second component, and the other ingredients may be divided as appropriate between the two components.
• (Meth)acrylic acid should preferably be used in the second component.
• This two-component type curable resin composition may be used as an adhesive after bringing the components into contact immediately prior to use and curing.
• the adhesive composition of the present invention may be used to bond parts together to form a bonded object. Additionally, the various materials of the adhered parts should exhibit particularly good adhesiveness and transparency with respect to transparent resins (for example, acrylic resins, polycarbonate resins, etc.).
• transparent resins for example, acrylic resins, polycarbonate resins, etc.
• the above-described curable resin composition and the like may contain additives that are normally used in the production of resin compositions, in amounts within a range that will not detract from the effects of the present invention.
• additives include fillers chosen from among inorganic materials such as calcium carbonate, aluminum hydroxide, silica, clay, talc and titanium oxide, inorganic hollow materials such as glass balloons, Shirasu balloons and ceramic balloons, organic materials such as nylon beads, acrylic beads and silicon beads, and organic hollow materials such as vinylidene chloride balloons and acrylic balloons, foaming agents, dyes, pigments, silane coupling agents, polymerization inhibiting agents and stabilizing agents.
• inorganic materials such as calcium carbonate, aluminum hydroxide, silica, clay, talc and titanium oxide
• inorganic hollow materials such as glass balloons, Shirasu balloons and ceramic balloons
• organic materials such as nylon beads, acrylic beads and silicon beads
• organic hollow materials such as vinylidene chloride balloons and acrylic balloons
• the use of the above-described curable resin composition as an adhesive (especially an adhesive for use with transparent resins) or a coating (especially a coating for use with transparent resins), and a method of bonding or a method of coating bonded objects (especially transparent resins) with the above-described curable resin composition (or result of curing thereof) are included among embodiments of the present invention.
• a method of producing a composite comprising the steps of applying the above-described curable resin composition to the surface of an object to be bonded (especially a transparent resin) so as to bond or coat the object to be bonded is also included among the embodiments of the present invention.
• the units for the amounts of the respective substances used are expressed in parts by mass.
• room temperature shall refer to 23° C.
• the various physical properties were measured as follows.
• a sample was diluted with tetrahydrofuran to 0.1 wt/V %, filtered with a membrane filter, then measured by size exclusion chromatography (SEC).
• Td diffuse transmittance
• Tt total luminous transmittance
• An adhesive obtained by mixing two components was applied to one surface of a test sample (100 ⁇ 25 ⁇ 5 mm polycarbonate resin or 100 ⁇ 25 ⁇ 3 mm acrylic resin), which was immediately laid over and bonded to another test sample (100 ⁇ 25 ⁇ 5 mm polycarbonate resin or 100 ⁇ 25 ⁇ 3 mm acrylic resin), then let stand for 24 hours at room temperature to form a sample for testing tensile shear adhesion strength.
• minute amounts of glass beads of grain size 125 ⁇ m were added to the adhesive.
• a haze meter Sud Test Instruments, TM double-beam type haze computer
• a curable resin composition was sandwiched between PET films and cured using a 1 mm thick silicon sheet as the mold, and let stand for 24 hours at room temperature to obtain a cured object of thickness 1 mm.
• the resulting cured object was cut to a length of 50 mm and a width of 5 mm using a cutter to form cured objects for measurement of glass transition temperature.
• the resulting cured objects were measured in a nitrogen atmosphere under conditions of a temperature increase speed of 2° C. per minute, using a dynamic visoelasticity measuring device DMS210 by Seiko Electronics, and the peak temperatures of the resulting tan ⁇ were recorded as the glass transition temperatures.
• the following triblock copolymer was used as the acrylic block copolymer.
• the triblock copolymer was a triblock copolymer of polymethylmethacrylate/poly-n-butylacrylate/polymethylmethacrylate.
• Product Name “LA4285” (Kuraray), poly-n-butylacrylate content 50 mass %, weight-average molecular weight 65,000, molecular weight distribution 1.1.
• Product Name “LA2140e” (Kuraray), poly-n-butylacrylate content 25 mass %, weight-average molecular weight 80,000, molecular weight distribution 1.1.
• the acrylic block copolymer satisfies the following formula (2): [a 1 ]-[b]-[a 2 ] (2)
• [a 1 ] is a polymer block consisting of polymethylmethacrylate, having a glass transition temperature of 100 to 120° C.
• [a 2 ] is a polymer block consisting of polymethylmethacrylate, having a glass transition temperature of 100 to 120° C.
• [b] is a polymer block consisting of poly-n-butylacrylate, having a glass transition temperature of ⁇ 50 to ⁇ 45° C.
• acrylonitrile-butadiene rubber As the acrylonitrile-butadiene rubber, the following was used.
• the present invention for example, has a high tensile shear adhesion strength of at least 2 MPa, as well as low haze values of no more than 18% for a polycarbonate resin composite, no more than 15% for an acrylic resin composite, and no more than 10% for a cured object, thus exhibiting good adhesiveness and transparency.
• the present invention is capable of maintaining high adhesiveness and maintaining transparency in bonding together transparent resins, so it is applicable to bonding applications to transparent resins such as show windows.

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